How to close opened SnackBar on closing of screen?

Question

I have a BottomNavigationBar for managing various screens. SnackBar is opened on one screen and when I go to another screen, the Snackbar stays still opened. I need to close it immediately when I switch to the another screen. I understand that removeCurrentSnackBar() method must be called in dispose method but when I tried to do this I get the error: Looking up a deactivated widget's ancestor is unsafe. It looks like context is already disposed.

So the question is in title.

Solution

The solution is simlple:

ScaffoldMessengerState snackbar;

void dispose() {
  snackbar.removeCurrentSnackbar();
  super.dispose();
}

void didChangeDependencies(BuildContext context) {
  super.didChangeDependencies(context);
  snackbar = ScaffoldMessenger.of(context);
}

Widget build(BuildContext context) {
  ...
  snackbar.showSnackbar(...);
  ...
}

Comments

[Ajil O.]

Are you sure you're calling .removeCurrentSnackBar() before super.dispose()?

[BambinoUA]

Yes. I place those line of code before super.dispose. Some message also said state is not stable in dispose method. I used global key for Scaffold but the value of currentState in dispose method is already null.

[SardorbekR]

@BambinoUA Have you found a solution for this? I am facing same issue now

[BambinoUA]

@SardobekR, see my answer.